Fixed size spring unit and method of forming same



y 1933- R. s. JONES v 1,916,512

FIXED SIZE SPRING UNIT AND METHOD OF FORMING SAME Original Filed Jan. 16; 1952 IN VENTOR. for .5. JO/Vf.

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Patented July 4, 1933 UNITED STATES ROY s. JONES, OFYANDERSON, INDIANA, Assreivon TO BARBER MANuFAcr RiNe j r COMPANY, OF ANDERSON, INDIANA,A CORPORATION FIXED SIZE SPRING UNIT AND. METHOD .OF FORMING SAME 7 Original applicationfiled January 16, 1932, Serial Il'o. 587,106. Divided and this application filed July 23,

1932. Serial No. 624,231.

This invention relates to aspring cushion unit suitable for seats of Coxwell chairs, davenports, and like cushion structures.

H The chief object of this-invention is to permanently anchor connecting members to coil springs to form aspring unit'of permanent length.

This is a division of the co-pending application, Serial No. 587,106, filed January 16, 1932. i

The chief feature of the invention consists in the process employed to permanently anchor the end spring coils of a spring unit so that the length of the unit will remain conrality of coilsprings 14 each of which has an upper and lower end coil 15. The springs stant while in use even though subjected to all sorts of strains.

Heretofore spring units have not been of a permanent length but have permitted the gradual separation of the end coil from the remainderof the unit due to the bending and flexing of that coil other than its axial collapse under load.

Another feature of the invention consists in the mashing of the connecting helix and simultaneously with the mashing of said connecting helix, the same is embedded into corrugations simultaneously formed in the end coil of the end coil spring, thereby permanently anchoring the end of the helix to the end coil spring and preventing any subsequent slippage or separation therebetween.

The full nature of the invention will be more clearly understood from the accompanying drawing and the following description and claim:

In the drawing, Fig. 1 is a top planview of a cushion base formed from a plurality of cushion units, three ends of which are substantially straight and the other of which is arcuate or curved, a part of the fabric enclosing the spring units being removed for illustrating in detail the same and other parts. Fig. 2 is an enlarged transverse sectional view through one portion of the cushion unit of the unit base, the coils being extended. Fig. 3 is a perspective view of the spring unit, the subject matter of the invention. Fig. 4 is a per spective view of the end of the helix and the adjacent end coil of the end coil spring, the parts being shown in the second to the last finished parts and the final step in the process.

Merely for an understanding of the invention, Figs. 1 and 2 illustrate a spring cushion having a plurality of elongated cells 10 which are of fabric and which are suit- KPATE NT OFFIC n t step of the process. Fig. 5 represents the helices in adjacent cells as also illustrated therein. 7

Each spring unit is comprised of a pluare arranged in spaced and parallel relation, as well as tandem relation, and are suitably assembled by any suitable method ,upon

. spective springs and is-threaded around the same for at least two turns. 1

The end of each helix 17 is similarly thread- F ed around each end coil-15 of the end coil spring 14 and preferably for three or more turns. Four helices are usually required although more might be employed under certain circumstances. 7 p

This formation last mentioned is illustrated in Fig. 4. The last step in the operation to form the permanent connection is to mash the helix into the end. coil of the end coil spring, thereby forming corrugations 18 in the end coil of the. end coil spring and thereby locking the end coil of the end coil spring to the end of the helix. Without this type of anchorage the spring unit in use when subjected to various strains and the end coil will transmit these strains. to the helix so that r the helix may revolve on itsaxis and thereby The present invention, therefore, prevents such separation under any and all stress to which the end coil is subjected,-thereby providing for theformation of a spring unit of permanent'length so that the out-line of the cushion shown in Fig. 1 can be permanently maintained.

gradually release the end coil. from the helix.

The invention claimed is: A spring unit of predetermined permanent length comprising a plurality of spring coils arranged in spaced and tandem relation and With their axes substantially parallel, a plurality of helices each having a plurality of coils interwoven with an end coil of each coil spring coil, the end of each helix terminating at an end coil spring, anda perma-.

nent connection betweensaid end of the helix and the end coil of the end coil spring comprised of a plurality of corrugations in said 1 my signature. V

i ROY S. JONES; 

